/* eslint-disable */

const Mode = require('./mode')
const Polynomial = require('./Polynomial')
const math = require('./math')

const QRMaskPattern = {
  PATTERN000: 0,
  PATTERN001: 1,
  PATTERN010: 2,
  PATTERN011: 3,
  PATTERN100: 4,
  PATTERN101: 5,
  PATTERN110: 6,
  PATTERN111: 7
}

const QRUtil = {

  PATTERN_POSITION_TABLE: [
    [],
    [6, 18],
    [6, 22],
    [6, 26],
    [6, 30],
    [6, 34],
    [6, 22, 38],
    [6, 24, 42],
    [6, 26, 46],
    [6, 28, 50],
    [6, 30, 54],
    [6, 32, 58],
    [6, 34, 62],
    [6, 26, 46, 66],
    [6, 26, 48, 70],
    [6, 26, 50, 74],
    [6, 30, 54, 78],
    [6, 30, 56, 82],
    [6, 30, 58, 86],
    [6, 34, 62, 90],
    [6, 28, 50, 72, 94],
    [6, 26, 50, 74, 98],
    [6, 30, 54, 78, 102],
    [6, 28, 54, 80, 106],
    [6, 32, 58, 84, 110],
    [6, 30, 58, 86, 114],
    [6, 34, 62, 90, 118],
    [6, 26, 50, 74, 98, 122],
    [6, 30, 54, 78, 102, 126],
    [6, 26, 52, 78, 104, 130],
    [6, 30, 56, 82, 108, 134],
    [6, 34, 60, 86, 112, 138],
    [6, 30, 58, 86, 114, 142],
    [6, 34, 62, 90, 118, 146],
    [6, 30, 54, 78, 102, 126, 150],
    [6, 24, 50, 76, 102, 128, 154],
    [6, 28, 54, 80, 106, 132, 158],
    [6, 32, 58, 84, 110, 136, 162],
    [6, 26, 54, 82, 110, 138, 166],
    [6, 30, 58, 86, 114, 142, 170]
  ],

  G15: (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0),
  G18: (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0),
  G15_MASK: (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1),

  getBCHTypeInfo(data) {
    let d = data << 10
    while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0) {
      d ^= (QRUtil.G15 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15)))
    }
    return ((data << 10) | d) ^ QRUtil.G15_MASK
  },

  getBCHTypeNumber(data) {
    let d = data << 12
    while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0) {
      d ^= (QRUtil.G18 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18)))
    }
    return (data << 12) | d
  },

  getBCHDigit(data) {
    let digit = 0

    while (data !== 0) {
      digit++
      data >>>= 1
    }

    return digit
  },

  getPatternPosition(typeNumber) {
    return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1]
  },

  getMask(maskPattern, i, j) {
    switch (maskPattern) {
      case QRMaskPattern.PATTERN000: return (i + j) % 2 === 0
      case QRMaskPattern.PATTERN001: return i % 2 === 0
      case QRMaskPattern.PATTERN010: return j % 3 === 0
      case QRMaskPattern.PATTERN011: return (i + j) % 3 === 0
      case QRMaskPattern.PATTERN100: return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 === 0
      case QRMaskPattern.PATTERN101: return (i * j) % 2 + (i * j) % 3 === 0
      case QRMaskPattern.PATTERN110: return ((i * j) % 2 + (i * j) % 3) % 2 === 0
      case QRMaskPattern.PATTERN111: return ((i * j) % 3 + (i + j) % 2) % 2 === 0

      default:
        throw new Error('bad maskPattern:' + maskPattern)
    }
  },

  getErrorCorrectPolynomial(errorCorrectLength) {
    let a = new Polynomial([1], 0)

    for (let i = 0; i < errorCorrectLength; i++) {
      a = a.multiply(new Polynomial([1, math.gexp(i)], 0))
    }

    return a
  },

  getLengthInBits(mode, type) {
    if (type >= 1 && type < 10) {
      // 1 - 9

      switch (mode) {
        case Mode.MODE_NUMBER: return 10
        case Mode.MODE_ALPHA_NUM: return 9
        case Mode.MODE_8BIT_BYTE: return 8
        case Mode.MODE_KANJI: return 8
        default:
          throw new Error('mode:' + mode)
      }
    } else if (type < 27) {
      // 10 - 26

      switch (mode) {
        case Mode.MODE_NUMBER: return 12
        case Mode.MODE_ALPHA_NUM: return 11
        case Mode.MODE_8BIT_BYTE: return 16
        case Mode.MODE_KANJI: return 10
        default:
          throw new Error('mode:' + mode)
      }
    } else if (type < 41) {
      // 27 - 40

      switch (mode) {
        case Mode.MODE_NUMBER: return 14
        case Mode.MODE_ALPHA_NUM: return 13
        case Mode.MODE_8BIT_BYTE: return 16
        case Mode.MODE_KANJI: return 12
        default:
          throw new Error('mode:' + mode)
      }
    } else {
      throw new Error('type:' + type)
    }
  },

  getLostPoint(qrCode) {
    const moduleCount = qrCode.getModuleCount()

    let lostPoint = 0

    // LEVEL1

    for (var row = 0; row < moduleCount; row++) {
      for (var col = 0; col < moduleCount; col++) {
        let sameCount = 0
        const dark = qrCode.isDark(row, col)

        for (let r = -1; r <= 1; r++) {
          if (row + r < 0 || moduleCount <= row + r) {
            continue
          }

          for (let c = -1; c <= 1; c++) {
            if (col + c < 0 || moduleCount <= col + c) {
              continue
            }

            if (r == 0 && c == 0) {
              continue
            }

            if (dark == qrCode.isDark(row + r, col + c)) {
              sameCount++
            }
          }
        }

        if (sameCount > 5) {
          lostPoint += (3 + sameCount - 5)
        }
      }
    }

    // LEVEL2

    for (var row = 0; row < moduleCount - 1; row++) {
      for (var col = 0; col < moduleCount - 1; col++) {
        let count = 0
        if (qrCode.isDark(row, col)) count++
        if (qrCode.isDark(row + 1, col)) count++
        if (qrCode.isDark(row, col + 1)) count++
        if (qrCode.isDark(row + 1, col + 1)) count++
        if (count == 0 || count == 4) {
          lostPoint += 3
        }
      }
    }

    // LEVEL3

    for (var row = 0; row < moduleCount; row++) {
      for (var col = 0; col < moduleCount - 6; col++) {
        if (qrCode.isDark(row, col)
					&& !qrCode.isDark(row, col + 1)
					&& qrCode.isDark(row, col + 2)
					&& qrCode.isDark(row, col + 3)
					&& qrCode.isDark(row, col + 4)
					&& !qrCode.isDark(row, col + 5)
					&& qrCode.isDark(row, col + 6)) {
          lostPoint += 40
        }
      }
    }

    for (var col = 0; col < moduleCount; col++) {
      for (var row = 0; row < moduleCount - 6; row++) {
        if (qrCode.isDark(row, col)
					&& !qrCode.isDark(row + 1, col)
					&& qrCode.isDark(row + 2, col)
					&& qrCode.isDark(row + 3, col)
					&& qrCode.isDark(row + 4, col)
					&& !qrCode.isDark(row + 5, col)
					&& qrCode.isDark(row + 6, col)) {
          lostPoint += 40
        }
      }
    }

    // LEVEL4

    let darkCount = 0

    for (var col = 0; col < moduleCount; col++) {
      for (var row = 0; row < moduleCount; row++) {
        if (qrCode.isDark(row, col)) {
          darkCount++
        }
      }
    }

    const ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5
    lostPoint += ratio * 10

    return lostPoint
  }
}

module.exports = QRUtil
